I asked a certain physicist to help me understand what happened in the sky near sunset in Copley Square. We discussed the interplay of light and shadow. How the sun below the horizon was illuminating the clouds from below. How the sharp line in the sky might result from shadows cast by something on the horizon. Then of course there were the clouds at different altitudes. Shorter wavelength blue light scattered out. Longer wavelength red light left behind. In the end all we could agree upon was that it was beautiful.

At this time of year I chase the sun even if that only means I race up the spiral staircase in my home to the highest window to see how the light changes over time in the distant sky.

And just as I thought I was done and walked back down the stairs to download images and such, I looked out the lower window and saw that the sky had turned from gold to orange.

And then, yes once more, when I thought I was done and had walked back down the stairs to download images and compose this post, I looked up. The sky was a wonderful pinkish-red. I decided to watch the sky grow dark instead of racing back up those stairs.